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Best Answer: Natural selection can increase the frequencies of alleles if they are advantageous to a species' survival and reproductive abilities.If they somehow produce a phenotype that is not a selective advantage, their frequency will decrease.lleles that give an organism a better chance of survival in their environment, better chance of reproduction, will become more frequent in a population. EX. There are dark and light moths in an environment.
role in natural selection. in natural selection. Gene frequencies tend to remain constant from generation to generation when disturbing factors are not present. Factors that disturb the natural equilibrium of gene frequencies include mutation, migration (or gene flow), random genetic drift, and natural selection. A mutation is a spontaneous change in the gene frequency that takes place in a population and occurs at a low rate. Migration is a... Read More.